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You have two forces fighting each other.

The aquasoil buffers the soil reducing dKH, while the seiryu stones are raising it.

I would test dKH every other day for a couple of weeks and see how it changes. If it varies a lot, then pH drop method is not going to work for you.

If you want to keep CO2 levels stable, you might look into getting a flow meter. It would help keep CO2 flow rate constant.

And by the way none of the plants you listed are particularly sensitive to dKH levels.
 

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great to hear! i dont plan on adding anymore more the time being.

I just did some research on the RO buddy. seems legit, and I will likely go this route to mix RO / tap water for my water changes. I want to avoid supplements for raising KH/GH so I plan to find a process that allows me to bring it down to the desired levels.

I will look at what the flow meter does, I am unfamiliar with it..
Dwyer RMA-151-SSV.

Let's you dial in a flow rate without trying to count bubbles.

Flow Meter
 
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